The 2009 Medibank International Sydney was a tennis tournament played on outdoor hard courts. It was the 117th edition of the event known that year as the Medibank International Sydney, and was part of the ATP World Tour 250 series of the 2009 ATP World Tour, and of the WTA Premier tournaments of the 2009 WTA Tour. Both the men's and the women's events took place at the NSW Tennis Centre in Sydney, Australia, from 11 through 17 January 2009.